I'm a third of the way through the first book, and I'm into my second really tough section. The issue here is that I hit the fast forward button and only provided a summary of what happened when I wrote the first draft:
"Over the next several months..."
Like a montage in a movie, but with even fewer details. It makes sense from one point of view: I had the section in there because it helps move the story forward. That said, what we're skipping over is the first few months of a friendship and a lot of research/exploration. That kind of stuff is a treasure chest of opportunity, so I'm working at fleshing it all out. It'll take a while, but I planned on this one being the biggest hurdle.
Also, since I've already written all three "books" (50 - 60k words each), I can go back now and "retcon" some facts/scenes to make things work better.